/*
 * @(#)ShellCat.java	1.0 Apr 18, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.io.console.shell.cmd;

import org.eoti.io.console.shell.ShellException;
import org.eoti.io.console.shell.ShellFileExtension;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.*;

public class ShellCat extends ShellFileExtension
{
	public ShellCat()
	{
		super();
	}

	public void execute(List<String> arguments)
			throws ShellException
	{
		if(arguments.size() != 1)
			error("Incorrect format. Expected 'cat FILENAME'.");

		String path = arguments.get(0);
		File file = getFile(path);

		if(file == null)
			error("Unable to locate to '%s'.", path);

		if(file.isDirectory())
			error("Unable to cat a directory.");

		if(!file.exists() || file.lastModified() == 0)
			error("File '%s' does not exist.", path);

		try{
			BufferedReader in = new BufferedReader(new FileReader(file));
			String line = "";
			int lineNumber = 1;
			while( (line = in.readLine()) != null)
				shell.writer().format("%d:  %s\n", lineNumber++, line);

			in.close();
		} catch(Exception e){
			error(e, "Error reading file '%s'.", file.getName());
		}
	}

	public String getName()
	{
		return "cat";
	}

	public String getUsage()
	{
		return "'cat FILENAME' to display a file.";
	}
}
